Music-leaf turner.



F. MARGERT v MUSIC LEAF TURNER. APPLICATION manna. 19.1916.

- Patented Dec. 4, 1917..

2 SHEE TSSHEET. 1.

F. MARGERT.

MUSIC LE'AF TURNER. APPLICATION FILED APR. 19. 1510.

Patented D60. 4, 1917..

2 SHEETS-SHEET 2 m. w M

FRANKMARGERT, OF MILWAUKEE, WISCONSIN.

MUSIC-LEAF TURNER.

Specification of Letters Patent.

Patented Dec. 4, 1917.

Application filed April 19, 1916. Serial No. 92,158.

To all whom it may concern: v

Be it known that I, FRANK MARGERT, a citizen of the United States, andresidentof Milwaukee, in the county of Milwaukee and State of Wisconsin,have invented new and useful Improvements in Music -Leaf Turners, ofwhich the following is a description, reference being had to theaccompanying drawings, which are a part of this specification.

This invention has for its object to provide a music leaf turner whichwill becapable of turning the leaves of sheet music, or a book, eitherto the right or to the left.

Another object of the invention is to provide a music leaf turner whichwill be independent of motor springs for swinging the leaf turning arms.

Another object of the invention is to provide a music leaf turner whichwill be simple and inexpensive in its construction and which will bestrong and durable in its op eration, easily controlled and quiet in itsaction.

With the above and other objects in view the invention consists in themusic leaf turner as herein claimed and all equivalents.

Referring to the accompanying drawings, in which like characters ofreference indicate the same parts in the different views,

Figure 1 is a front view of a music stand provided with a music leafturner constructed in accordance with this invention;

Fig. 2 is a side view thereof;

Fig. 3 is a front view of the main portion thereof with the casingsectioned;

Fig. 4 is a plan view thereof with the cover of the casing removed;

Fig. 5 is an enlarged detail view of the parts of the anchor pawl andthe series of ratchet leaves, only one set of ratchet teeth being shownto avoid confusion;

Fig. 6 is a perspective view of one of the ratchet leaves; I

Fig. 7 is a detail sectional plan view of the spring for returning theanchor pawl to its normal position after being moved in eitherdirection; and,

Fig. 8 is a sectional view on theplane of line 88 of Fig. 4.

In these drawings 10 indicates the base of a music stand, and 11 theeasel or broad fiat surface against which the music sheets are spread asusual. Theledge 12, against which the music leaves abut, is slidable onthe easel to accommodate it to the length of the music leaves in orderthat the upper edges of the music leaves may be engaged by clamps on theleaf turnii'ig arms, to be later described. At the upper edge of theeasel 11 is secured a base plate 13 carrying a cylindrical casing 1a inthe center of which is a shaft 15 journaled in a bracket 16 removablysecured to the base plate. This shaft forms a pivotal support for anumber of ratchetleaves 17 there being six of'them in the constructionshown, though the number may be more or less. These ratchet leaves 17are of the shape shown in Fig. 6, thoughtheir dimensions necessarilyvary in order that they may nest together and be pivotally mounted onthe shaft. As shown in this figure, the ratchet leaf consists of a plateof sheet metal with its inner edge bent outwardly at right anglesthereto to form a flange 18, and the ends of such flange bent over atright'angles to the flange to form parallel pivot cars 19 with openingsat their ends which fit around the shaft 15. The length of the flange 18and the length of the pivot arms 19 vary with the successive ratchetleaves in order that they may nest together in the manner shown in Fig.3, and theparts are so positioned on the base plate 13 that the ratchetleaves 17 travel through a semi-circular opening in the bottom of thecasing. Each ratchet leaf at its outer lower portion has a pivotalconnection 20 for one of the leaf turning arms 21 which may thus beswung upwardly but which is limited in its downward swing to ahorizontal position by the engagement thereof with a stop lug 21 bentout from the pivotal connection. Spring clips 22 are carried by the leafturning arms 21 to engage the upper edges of the music leaves so thatswinging movements of the arms 21 will be imparted to the music leaves,and each ratchet leaf 1? furthermore has an upper ratchet tooth 23 and alower ratchet tooth 24:, the former turned in one direction and thelatter turned in the opposite direction.

The upper ratchet teeth 23 of the successive leaves are progressivelylonger, while the lower ratchet teeth 24 are progressively shorter.Thus, when the. leaves are assem bled in any one position they presenttwo serie of stepped ratchet teeth with their stepped arrangementinclining in opposite directions. A sleeve 25 is loosely mounted on theextension of shaft 15 and is provided with oppositely extending arms 26with spring pressed hooks or dogs 27 at their ends to form an anchorpawl. The spring pressed hooks or dogs 27 are desirably limited in theirpivotal movements on. the arms 26 by a pin and slot connection 28between them, as shown in Fig. 5. As seen in Fig. 3 the hooks 27 are notin the same plane, but the one 011 the left is in the plane of theseries of ratchet teeth 23, while the one on the right is in the planeof the series of ratchet teeth 2 1. The sleeve 25 carries a pinion 29which meshes with a segmental gear 30. A partition 31 extends across therear portion of the casing where it is seated on screw posts 32 and toit is riveted an upstanding post 33 upon which the segmental gear 30 isrotatably mounted. The segmental gear 30 has a normal central neutralposition in which it is held by spring action and from which it may beturned in either direction. Such spring action is produced by a coilspring 3% surrounding the hub of the segmental gear 30 with itsoppositely extending ends engaging studs 35 projecting downwardly fromdiametrically opposite parts of the segmental gear wheel 30. Theseoppositely extending ends of the spring 34L also engage stationary pins36 projeoting upwardly from the partition 31 on opposite sides of thepost 33, as shown in Figs. 7 and 8, and when the segmental gear 30 ismoved in either direction one of the studs 35 moves away from the end ofthe spring, leaving it held by the pin 36, while the other stud 35carries the other end of the spring away from its pin 36, as shown bydotted lines in Fig. 7. In this manner the segmental gear is returned toits neutral or normal central position by the spring 34L after it hasbeen moved in either direction.

Projecting from the upper part of the segmental gear 30 is a flange 37having looped or rounded ends and openings there through near the loopsthrough which are passed the knotted ends of a pair of cords or cables38, the knots thereof becoming seated behind the loops. These cords orcables are passed out through the back of the casing over a curved lip39 and extend down to oppositely projecting arms 10 on a rock shaft 41which is journaled on a bearing strip 42 of the base, a double treadle43 on said rock shaft 41 is adapted to be engaged by the foot of themusician to turn the rock shaft in one direction or the other, and thuspull upon one cable or the other to turn the segmental gear 30 to theright or left as the case may be.

In operation the pressure of the foot on the left side of the treadleexerts a pull on the left cable causing the segmental gear-30 to turn ina clockwise direction, as viewed from above. This ives an anti-clockwisemovement to the pinlon 29 to cause the left arm 26 to swing forwardlyand bring its hook 27 into engagement with the ratchet tooth 23 of theforemost ratchet leaf 17, causing said ratchet leaf to swing and turnthe front leaf of music from left to right, the anchor pawl carrying theparts for a greater portion of their are of travel which is completed bythe momentum of the parts and the action of gravity owing to theinclined position of the easel. The release of the treadle permits thespring 34: to restore parts to their normal positions, the end of thedog 27 beyond the hook portion thereof being rounded to permit it toride past the ratchet teeth and be in position to engage the end ratchettooth upon the next operation of the treadle.

The direction of the operation as described happens to be such as willturn the leaves backwardly, but is the operation which will be bestunderstood from the drawings. For turning the leaves forwardly fromright to left the right side of the treadle is depressed, causing allparts to op erate in the opposite direction to that previously describedand bringing the right arm 26 forwardly so that the right hook 27 byengaging the ratchet tooth 24 of the front ratchet leaf will swing itaround to turn the leaf as before described. Thus the leaves may beturned in either direction, and because of the stepped arrangement ofthe ratchet teeth 23 and 2 1, only the front leaf will be turned ineither direction of operation. The turning movement of the leaves may bemade as quickly or as slowly as de sired, depending upon the characterof the pressure on the treadle, as such pressure constitutes the motivepower and the spring only serves to restore the parts to their normalposition after the operation.

The two sets of ratchet teeth 23 and 24; form advancing and returningratchets respectively, and the anchor pawl constitutes a common meansfor operating upon either ratchet according to whether it is swung tothe right or the left of its normal position. This makes the devicesimple in its construction and inexpensive to manufacture though it iseflicient in its operation and not liable to get out of order.

The term anchor pawl is used with its ordinary significance as being apair of rocking arms each having engagement with successive ratchetteeth or the like when the arms are rocked to a position for thatpurpose.

The casing is desirably provided with a cover as through which the post33 and the shaft 15 project, the latter preferably having a nut 45threaded thereon to hold the cover in place.

The music leaf turner of this invention is of few simple partsinexpensive to manufacture and strong and durable and eflicient in use.

What I claim as new and desire to secure by Letters Patent is:

l. A music leaf turner, comprising a series of leaf members pivotallymounted on a common axis, two sets of engaging teeth on the leafmembers, one set in ascending stepped relation and the other set indescending stepped relation to form advancing and returning ratchets, arotatably mounted member, a pair of spring pressed pawls thereon forengaging the respective sets of engaging teeth, means for turning saidmember in either direction, means for returning said member to a neutralposition, and means for connecting the leaf members to the music leaves.

2. In a music leaf turner, a series of leaf members pivotally mounted ona common axis, two sets of stepped engaging teeth formed thereon, theengaging teeth of one set being progressively longer and theengagingteeth of the other set being progressively shorter to formadvancing and re turning ratchets, a suitably mounted anchor pawl havinga pawl member for each set of engaging teeth adapted to engage saidteeth respectively with the successive movements thereof, a pinioncarried by the anchor pawl, a gear wheel meshing with the pinion, springmeans for moving the gear wheel to a neutral position, means for turningthe gear wheel in either direction away from its neutral position, andmeans for connecting the leaf members to the music leaves.

3. In a music leaf turner, a series of leaf members pivotally mounted ona common axis, two sets of stepped engaging teeth formed thereon, theengaging teeth of one set being progressively longer and the en gagingteeth of the other set being progressively shorter, a suitably mountedanchor pawl having a pawl member for each set of engaging teeth adaptedto engage said teeth respectively with the successive movements thereof,a pinion carried by the anchor pawl, a gear wheel meshing with thepinion, a coil spring surrounding the hub of the gear wheel, stationarystops normally engaged by both ends of the spring, projections on thegear wheel for engaging said ends of the spring whereby the spring actsto move the gear wheel to a neutral position, means for turning the gearwheel away from its neutral position in either direction, and means forconnecting the leaf members to the music leaves.

4. In a music leaf turner, a stand, a series of leaf members pivotallymounted thereon on a common axis, two sets of stepped engaging teethformed thereon, the engaging teeth of one set being progressively longerto form an advancing ratchet and the engaging teeth of the other setbeing progressively shorter to form a returning ratchet through theseries of leaf members, a suitably mounted anchor pawl having a pawlmember for each set of engaging teeth adapted to engage said teethrespectively with the successive movements thereof, a pinion carried bythe anchor pawl, a gear wheel meshing with the pinion, spring means formoving the gear wheel to a normal position, a pair of cables connectedwith the gear wheel, and a double treadle at the base of the stand towhich the cables are connected, and means for connecting the leafmembers to the music leaves.

5. In a music leaf turner, a stand provided with an inclined easel, amusic rest adjustably mounted thereon, a casing secured to the easel, afixed shaft passin through the casing, a series of leaf mem%erspivotally mounted on the shaft, leaf turning arms pivotally mounted onthe leaf members, spring clips thereon for engaging the music leaves,two sets of engaging teeth formed on the series of leaf members, the twosets being in stepped relation and in opposite order to form advancingand returning ratchets, an anchor pawl pivotally mounted on the shaftand provided with a pair of spring pressed pawl members, one for eachset of engaging teeth and adapted to engage said teeth consecutivelywith the successive movements of the anchor pawl, a pinion on the anchorpawl, a gear wheel meshing with the pinion, a spring for moving the gearwheel to a neutral position, a pair of cables connected with the gearwheel on opposite sides of its center and passing out of the casing, ashaft mounted at the base of the stand, oppositely extending arms on theshaft to which the cables are connected, and a right and left treadle onthe shaft.

In testimony whereof I aflix my signature, in presence of a witness.

FRANK MARGERT.

Witness:

R. S. C. CALDWELL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Estonian, Washington, D. G.

